Periodic reminder: Evidence of alien intelligence 
. Evidence of alien microbes 
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http://www.independent.co.uk/news/science/aliens-proof-evidence-facts-stars-scientists-extraterrestrial-life-et-intelligence-a7377716.html …
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Actually, evidence of alien intelligence (one with star-travel ability) could be
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On the contrary! In the absence of ET the most likely filters are behind us or within our power to stop (self-destruction).
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I guess advanced alien life is a double-edged sword. It either means the Filter isn't so Great, or those aliens are the Filter.
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